Hello! You can definitely resend to those folks. You'll want to head over to your response page and click on the response for that particular mailing. You'll then want to click on the "bounces" bar. Once the next page loads up, you'll see a button up towards the upper right which says "save this tab as a segment" This will kick you over to your audience page while also saving those folks as a segment. You can then jump back into your mailing and send to that specific segment.